The aim of this study is to explore the factor structure and internal consistency of the Eating Disorder Inventory-3 (EDI-3) among female adolescents from Buenos Aires (Argentina). 725 high school students, aged 13 to 19 years, completed the EDI-3 and a sociodemographic questionnaire. Different factor solutions were evaluated. The most satisfactory solution was reached to explore, first, the items of the three Eating Disorder Risk Scales (good structure, variance explained = 46.7%) and on the other, items of the Psychological Scales (with partial divergence from theoretical structure, variance explained = 44.1%). The computation of Composites (combining different scales proposed by the author) fitted more closely to the original version. Internal consistency coefficients for most scales were adequate. In analyzing the discriminatory power of the items, it was found a "floor effect" on some scales, this being expected in general population. We conclude that the EDI-3 is a valid instrument for the assessment of risk for eating disorders in general population and, consequently, its early detection. We discuss the use of this instrument in general population. ResumenEl objetivo de este estudio es explorar la estructura factorial y la consistencia interna del Inventario de Trastornos Alimentarios-3 (EDI-3) en adolescentes mujeres de Buenos Aires (Argentina). 725 estudiantes de escuelas secundarias, entre 13 y 19 años, completaron el EDI-3 y un cuestionario sociodemográfico. Se evaluaron diferentes soluciones factoriales. La solución más satisfactoria se alcanzó al explorar, por un lado, los ítems de las tres escalas de riesgo de trastorno alimentario (buena estructura, varianza explicada 46,7%) y por el otro, los ítems de las escalas psicológicas (estructura parcialmente diferente de la teórica, varianza explicada: 44,1%). El cómputo por Índices (agrupación de distintas escalas propuesta por el autor) se adecua más a la versión original. Los coeficientes de consistencia interna fueron adecuados en la mayoría de las escalas. Al analizar la capacidad discriminante de los ítems, se observó un "efecto suelo" en algunas escalas, siendo esto esperable en población general. Se concluye que el EDI-3 resulta un instrumento estructuralmente válido para la evaluación de riesgo de trastorno alimentario en población general y, en consecuencia, su detección temprana. Se discute el uso del instrumento en población general.
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